Function harfbuzz_sys::hb_font_set_user_data

pub unsafe extern "C" fn hb_font_set_user_data(
    font: *mut hb_font_t, 
    key: *mut hb_user_data_key_t, 
    data: *mut c_void, 
    destroy: hb_destroy_func_t, 
    replace: hb_bool_t
) -> hb_bool_t